(Japanese: マサゴタウン, Masago Town) is a location in the region of Sinnoh, the featured area in the upcoming Generation IV games, Pokémon Diamond and Pearl. The town was first featured in a promotional video for Diamond and Pearl. The video featured the player as a female walking through the town towards a beach south of Masago. The beach is part of Route 219, and is in close proximity to the town itself. Other information concerning this new area has not been released, though it is certain that Sandgem will play the same role as Viridian City, Cherrygrove City and Oldale Town, serving as the town closest to the player's hometown. "Masago" means "sand" in Japanese.
It is rumored to be "Sandgem Town", but their is not proof to support the name.